get a 3" downpipe-back or cat-back exhaust, 2.5 isn't a wide enough diameter for a turbo app.
unless you're getting a wideband O2 sensor, don't get an A/F gauge, cause it'll only be somewhat accurate at WOT. for gauges, it's best to get an EGT and boost gauge at least.
for injectors, get dsm 450s, or rc 440s. if you don't get a standalone system (i.e. Hondata), then you'll need an AFC and perform the AFC hack with it (
http://www.illimport.com/forum/showt...s=&threadid=85 ) If you do get a standalone, you won't need an AFC.
def. get an FMIC
an in-tank walbro pump is a neccessity as well.
for blow-off valve, I recommend the GReddy Type-S. It's great, and perfect for what you'll be running.
anything previously mentioned in this thread, I havn't said it this post, means you should get it.
good luck and post up any more questions. also, post up your final list before ordering so we can let ya know if you left anything out.